<?php
   $uploaddir = $_SERVER['DOCUMENT_ROOT']."/workspace/pub/";//设置文件保存目录 注意包含/   
//$uploaddir = "./";
$type=array("jpg","gif","bmp","jpeg","png");//设置允许上传文件的类型

$_FILES['file'] = $_POST['tmp_file'];
$_FILES['file']['name'] = $_POST['file'];


$a=strtolower(fileext($_FILES['file']['name']));
//判断文件类型
if(!in_array(strtolower(fileext($_FILES['file']['name'])),$type)) {
	$text=implode(",",$type);
    echo "您只能上传以下类型文件: ",$a,"<br>";
}
   //生成目标文件的文件名   
   else{
   $filename=explode(".",$_FILES['file']['name']);
   do{
     $filename[0]=random(10); //设置随机数长度
     $name=implode(".",$filename);
     //$name1=$name.".Mcncc";
     $uploadfile=$uploaddir.$name;
   echo $uploadfile.'<br />'.$_FILES['file']['tmp_name'].'<br />';
   }while(file_exists($uploadfile));

   try {
   	
	if ( move_uploaded_file($_FILES['file']['tmp_name'],$uploadfile) ){
		
		$pubfile = str_replace($_SERVER['DOCUMENT_ROOT'], "http://localhost", $uploadfile);
		
		 echo "<center>您的文件已经上传完毕 上传图片预览: </center><br><center><img src='{$pubfile}'></center>";
                echo"<br><center><a href='javascrīpt:history.go(-1)'>继续上传</a></center>";

       }
   }catch (Exception $e){
   	echo $e->getMessage();
   }
   
}















//获取文件后缀名函数
function fileext($filename){
	return substr(strrchr($filename, '.'), 1);
}
//生成随机文件名函数   
function random($length){
	$hash = 'kkyoo-ld-';
	$chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz';
	$max = strlen($chars) - 1;
	mt_srand((double)microtime() * 1000000);
	for($i = 0; $i < $length; $i++){
		$hash .= $chars[mt_rand(0, $max)];
    }
    return $hash;
}
?>